Currently the server/src/bin/shutdown.sh contains only two jars:
JBOSS_BOOT_CLASSPATH="$JBOSS_HOME/bin/shutdown.jar:$JBOSS_HOME/client/jbossall-client.jar"
and as far as I can tell it requires:
JBOSS_BOOT_CLASSPATH="$JBOSS_HOME/bin/shutdown.jar:$JBOSS_HOME/client/jbossall-client.jar:$JBOSS_HOME/lib/jboss-bootstrap-spi-as.jar:$JBOSS_HOME/lib/jboss-bootstrap-spi-mc.jar:$JBOSS_HOME/lib/jboss-bootstrap-spi.jar:$JBOSS_HOME/lib/jboss-system-jmx.jar:$JBOSS_HOME/lib/jboss-kernel.jar"

If you like feel free to assign this to me.